Online PHP editor | perf for LaffP

@ 2020-10-02T16:18:46Z

<?php

function getBigArray($n){
    $arr = [];
    for ($i=0; $i<$n; $i++) {
        $arr[] = $i;
    }
    return $arr;
}


function testSpeed1($n){
    $array1 = getBigArray($n);
    $array2 = getBigArray($n);
    $new = [];
    $start = microtime(true);
    testArrayManipulation1($array1, $array2);
    $new[] = $array1;
    $end = microtime(true);
    return $end-$start;
}

function testSpeed2($n){
    $array1 = getBigArray($n);
    $array2 = getBigArray($n);
    $new = [];
    $start = microtime(true);
    $new[] = testArrayManipulation2($array1, $array2);
    $end = microtime(true);
    return $end-$start;
}

function testSpeed3($n){
    $array1 = getBigArray($n);
    $array2 = getBigArray($n);
    $new = [];
    $start = microtime(true);
    $new[] = testArrayManipulation3($array1, $array2);
    $end = microtime(true);
    return $end-$start;
}

function testArrayManipulation1(&$array1, $array2){
    foreach($array2 as $v){
        $array1[] = $v;
    }
}

function testArrayManipulation2(&$array1, $array2){
    foreach($array2 as $v){
        $array1[] = $v;
    }
    return $array1;
}

function testArrayManipulation3($array1, $array2){
    foreach($array2 as $v){
        $array1[] = $v;
    }
    return $array1;
}


$n = 10;
$test1 = [];
$test2 = [];
$test3 = [];
for ($i=0; $i<$n; $i++) {
    $length = 100000;
    $test1[] = testSpeed1($length);
    $test2[] = testSpeed2($length);
    $test3[] = testSpeed3($length);
}

echo array_sum($test1)/count($test1);
echo '<br>';
echo array_sum($test2)/count($test2);
echo '<br>';
echo array_sum($test3)/count($test3);

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

Version	System time (s)	User time (s)	Memory (MiB)
7.4.11	0.360	0.415	31.42
7.4.10	0.385	0.395	31.55
7.4.9	0.400	0.387	31.58
7.4.8	0.315	0.434	31.52
7.4.7	0.532	0.482	31.33
7.4.6	0.482	0.501	31.57
7.4.5	0.363	0.452	31.50
7.4.4	0.370	0.413	31.59
7.4.3	0.315	0.441	31.51
7.4.2	0.379	0.396	31.54
7.4.1	0.452	0.488	31.52
7.4.0	0.404	0.388	31.47
7.3.23	0.418	0.379	31.34
7.3.22	0.416	0.366	31.29
7.3.21	0.362	0.441	31.25
7.3.20	0.359	0.385	30.99
7.3.19	0.406	0.465	31.46
7.3.18	0.426	0.423	31.05
7.3.17	0.404	0.392	31.22
7.3.16	0.360	0.444	31.19
7.3.15	0.365	0.446	31.15
7.3.14	0.348	0.428	31.17
7.3.13	0.361	0.378	31.25
7.3.12	0.362	0.406	31.29
7.3.11	0.373	0.410	31.15
7.3.10	0.410	0.376	31.41
7.3.9	0.345	0.422	31.24
7.3.8	0.330	0.432	31.15
7.3.7	0.343	0.412	31.18
7.3.6	0.374	0.392	31.36
7.3.5	0.336	0.414	31.34
7.3.4	0.345	0.412	31.21
7.3.3	0.386	0.373	31.18
7.3.2	0.463	0.418	31.20
7.3.1	0.481	0.388	31.29
7.3.0	0.593	0.383	31.21
7.2.34	0.386	0.423	31.44
7.2.33	0.367	0.464	31.50
7.2.32	0.407	0.457	31.58
7.2.31	0.365	0.497	31.35
7.2.30	0.361	0.490	31.52
7.2.29	0.365	0.422	31.41
7.2.28	0.374	0.409	31.66
7.2.27	0.338	0.500	31.53
7.2.26	0.373	0.536	31.61
7.2.25	0.441	0.524	31.73
7.2.24	0.357	0.470	31.50
7.2.23	0.364	0.444	31.27
7.2.22	0.392	0.439	31.62
7.2.21	0.367	0.437	31.37
7.2.20	0.409	0.450	31.58
7.2.19	0.336	0.469	31.47
7.2.18	0.378	0.438	31.62
7.2.17	0.317	0.531	31.23
7.2.16	0.389	0.379	31.50
7.2.15	0.590	0.437	31.58
7.2.14	0.491	0.445	31.40
7.2.13	0.439	0.462	31.47
7.2.12	0.537	0.510	31.34
7.2.11	0.504	0.437	31.62
7.2.10	0.593	0.456	31.59
7.2.9	0.578	0.479	31.41
7.2.8	0.475	0.485	31.61
7.2.7	0.537	0.448	31.55
7.2.6	0.505	0.460	31.54
7.2.5	0.583	0.388	31.57
7.2.4	0.624	0.489	31.35
7.2.3	0.466	0.445	31.60
7.2.2	0.529	0.455	31.45
7.2.1	0.458	0.448	31.63
7.2.0	0.457	0.443	31.55

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